Other Freelander 2 TD4 HSE 2007 Flashing dashboard cluster

When the temperature outside exceeds 18/19 degrees the dash board lights go crazy flashing and the needles fluctuate, the indicators, electric windows and locking system all fail while they are flashing.
Been to garage, had new computer system installed and a complete new heater panel. Problem is still unresolved. Anyone got any ideas please?
My Landrover is a Freelander 2 TD4 HSE 2007
Thanks

Is that definite 18/19 as displayed
if so
external temp sensor?
don't know if that would do crazy stuff

Or is that temp bringing on heating that then causes an issue?

Well my garage man changed the heating panel probably thinking same, it made no difference. However, external temperature sensor, you may have something there! Thanks I'll relay this to my man

J_D said:

Or is that temp bringing on heating that then causes an issue?

Click to expand...

I reckon it's a ground fault, bought on by a change in temperature. So I'd be taking it back to have the old ECU refitted and a refund provided. Then go through every grounding point in the vehicle, as I suspect that's what it is.